Connecter plug



T. C. ROBERTS CONNECTER PLUG May 8, 1928.

Filed Aug. 18, 1921 R 0 T N E V m Theodore 6720691119 ATTORNEY 40' In the drawing'se- Patented May 8, 1928.

- UNITED STATES PATENT OFFICE.

THEODORE O. ROBERTS,

DIGTAIEONE CORPORATION, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK .oom'rncrnn rave.

Application ma August 18, 1921. Serial 116. 493,476.

' This invention relates to improvements in cable connections, and particularly in eleo-' trical plug-socket connections.

An object of the invention is to provide a structure adapted, when assembled in op erative position, to relieve the cable-ends and their connectionsfrom any strain which may be put upon the cable itself. v 6

Another object is to provide a device of this character which is simple and cheap to construct, easy to assemble and disassemble with its cable, and adapted to withstand rough handling.

In the use of plug-sockets on portable machines, such as dictation machines, the com nection is often subject to considerable strain; and, in detachin the M -socket, the ,cord is quite often jerked or pul ed with such force as to loosen the terminal connec- 2 tions. So a further object of this invention is to provides. plug-socket which will take up al thisstrain in itself, and without transmitting any appreciable part of it to the terminal connections. I c

A further object is to provide such a structure which will provide complete and effectivednsulation between the terminals.- To

this end, means are provided for separating the interior of the connectlon into separate Chambers for the respective terminal connections, so that the ossibility of short' circuitin is entirely e iminate v Wi the above and other objects in view, as may hereinafter be suggested, one embodiment of the invention 1s shown in the accompanying drawings, and this will now be more f l descrlbed with reference thereto, and t e invention finally pointed out in claim. I

Fig. 1 is a view, in side elevation, of the termmal-connection member of the device.

Fig. 2 is a rear end view, and Fig. 3 is a front end view of the same.-

, Fig. 4 is a view, in side elevation, of the r, cover member.

. Fig. 5is a rear-end view, and- Fig. 6 is a front end view of the same. Fig. 7 is a sectional view of the completely assembled device, and showing the cord connected to the terminals, the means of re- Having the cables-strain therefrom, and the means of effective insulating the terminals from each 0t er.

responding parts throughout the several figand particularly 'to- Figure 7 thereof, the device, according to the present embodiment, comprises two main parts or members-one a terminalconnection' member, and the other a cover member, both formed of suitable insulation material, preferably of a moldable phenolcondensation product or like substance.

The terminal-connection member (Fig. 1 comprises an intermediate exteriorly-threa ed portion 10, a forwardly-extending reduced cylindrical portion flat barrier rib 12 extending rearwardly.

A pair ofterminal posts or other conductible material, are molded into the cylindrical portion 11, and extend in spaced relationfrom the front face of the portion 11 to and through the rear face of portion 10, and at each side of the barrier rib, as shown. The forward ends of the posts are disposed slightly below the surface of the po tion 11, and are surrounded bycountersunk areas 15 of portion 11 "and are provided with sockets 16 adapted to engaged b (not shown); T

' are adapted to guide the plug terminals into the usual plug termlnals e countersunk portions 15 one of the on NEW YORK, N. Y., assrenoa, BY MESNE assronmnnrs, mo

11, and a central (Fig. 7 of brass pinched fins-or flanges 18 an '19, (Figs. 8 I

and 9), adapted to'firmly anchor the posts in the molded terminal-connection member. Flat plate portions ,20 are providedupon the ends of the posts, and extend, when in assembled position, to rier 12, and in parallel relation thereto. And upon these portions 20 are mounted terminal screws 21 for holding the looped ends of the conductor wires and in electrical contact thereto. The outer corners of the plates are bent outwardly, as at 22 and 23, in such manner as to aid in confining the wires upon the plates.

The. cover member, (Figs. 4, 5, and 6), is

each side of the barupon the plates,

of substantially bottle-shape, and at its enlarged end is interiorly-threaded, as at 24, gig. 7), to engage the corresponding reads 1n the terminal-connection member. At its small end 25, there is rovided a restricted passage 26, and ad acent this, a larger-diameter portion 27 forming an annular curved shoulder 28 with the portion 26, and an annular curved shoulder 29 with the main opening surrounding the terminal connections.

A metal sheath 30, (Figs. 4 and 7 is provided about the cover member, being secured by crimp or spinning over the large end, as at 31, (F g. 4). This sheath is provided with surface knurlin 32 to facilitate gripping of the device w en assembling or disassembhng.

1n assembling, the cover member is first slid over the cord 33, and? the insulated end portions and 35 of the conductor wires are knotted, as at 36, the knot being of such size as not to pass through the restricted passage 26, but fitting into the portion 27 against the shoulder 28. The exposed'wire ends 37 and 38 are looped, and are secured to the plate portions'20 by means of the screws 21; the cover member is then screwed into engagement with the terminal-connecggin member, as shown in Fig. ;7, the cord .33 en thus assembled, the barrier 12 is located in close proximity to the recessed portion 27, as seen in Fig. 7, so as to limit the movement of the knot inwardly of the terminal-connection member.

It is thus seen that there is provided in this structure a means of positively assemb the two members of the device, of effectively insulating the terminals from one another and from the exterior of the device, and so prevent short circuiting, and finally, of relieving the terminals of any tensional stram which may be put upon the cable.

The metal dieath enclosing the device actsfree to revolve within the passage 26.,

as reinforcin and eliminates all danger of breakage of t e cover member when the wire knot is forced against it through heavy strains on the cable; it also adds appreciably to its appearance.

While the invention has been described as embodying certain features of construction and arrangement of parts, and adapted for a certain kind of use, it is understood that it is not so limited, but includes the broad conception of the :various features disclosed, and contemplates changes within the spirit and scope thereof.

Having described one illustrative embodiment of the invention, what is claimed as new, and for which Letters Patent is de-' sired, is:

A device of the character described, comprising a terminal-connection member, terminal connection means carried by said member disposed in spaced relation, and having exposed means at their inner ends for securing the terminals of electric conductors, a barrier rib protruding from the member between the inner ends of the connection means, and a cover member detachably connected to the terminal-connection member, enclosing the terminal connections, and having an opening through which the conductors pass, a recessed portion within the cover member disposed between the terminal connections and said opening, and being of greater diameter than said opening, the recess ada ted to receive a knot or other enlargement ormed upon the conductors to withstand strains thereon, without transmission of such strains to the terminal connec tions, the barrier'rib being located ad'acent said recess and being adapted to limit the movement-of'the knot inwardly of the terminal-connection member.

-Si ed-at Bridgeport in the county Fair old, and State of Connecticut, this 15th day of August, A. D. 1921.

-. THEODORE C. ROBERTS. 

